Beginning of Vassa
Beginning of Vassa is held on July 18. First waning moon, 8th Thai lunar month. This event in the second decade of the month July is annual. 
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Vassa, also known as Buddhist Lent or the Rains Retreat is a spiritual retreat that lasts three lunar months during the region's rainy season (from July-October). During this time, monks engage in deep meditation within the monastery grounds and Buddhists in general revive their spiritual training.
The Vassa tradition predates the time of Gautama Buddha. It was a long-standing custom for mendicant ascetics in India not to travel during the rainy season as they may unintentionally harm crops, insects or even themselves during their travels. Many Buddhist ascetics live in regions which lack a rainy season.
Similar holidays and events, festivals and interesting facts
Women's Day in Myanmar on July 3
Asalha Puja on July 18
Martyrs' Day in Burma on July 19 (Myanmar);
National Day in Myanmar on December 1
Bo Aung Kyaw Day in Myanmar on December 20
Myanmar Independence Day on January 4 (is celebrates the independence of Myanmar from the United Kingdom in 1948);
Teachers' Day in Thailand on January 16